Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 ff8b7f40158ab0a7…

MALICIOUS

Office (OLE) / .XLSX

142.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: c15bc20687994d6d071386c43d95da9a SHA-1: 5724cac62cbe2be8895a9a40765eb7fdbf6d136c SHA-256: ff8b7f40158ab0a71902b76e956a70e6513f8aa2316e92e2b85a1568e04b11c1
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that leverages Wscript.Shell and Scripting.FileSystemObject to create and execute batch and VBScript files. The VBScript appears to be a downloader, reconstructing the URL 'http://goyaluaa.vmeshaa.in/0v6kcnky/CG/' and other similar URLs from concatenated strings. The script then attempts to execute this downloaded payload using 'cmd.exe /c start /WAIT ...'. The presence of Wscript.Shell and the execution of external scripts strongly indicate a downloader pattern.

Heuristics 7

  • ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7821 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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